AggregateFrames

Passes along n sequential frames to the next Transform.

For a video with m frames, AggregateFrames would create a total of m-n+1 sequences ([0,n] ... [m-n+1, m])


DropFrames

Only use one frame every n frames.

For a video with m frames, DropFrames will pass on m/n frames.] * properties: None


OpticalFlowTransform

Gets a one-channel dense optical flow from two images